Power-driven grinder



July 31, 1923.

-w. E. KlDNEY POWER DRIVEN GRINDER Filed Feb. 10, 1923 Patented July 3i, 1923.

@NHTED STATES rattan Paranacastes.

WILLIS E. KIDNEY, OF CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND ELECTRIC MACHINE & MFG. (10., OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

POWER-DRIVEN GRINDER.

Application filed February 10, 1923. SerialNo. 618,266.

To all whom it may conccm:

Be it known that I, WILLIS E. KIDNEY, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Power-Driven Grinders, of which the following is a full, clear, and exact description.

The present invention relates to power w driven grinders of the screw type such as used for grinding meat. In the operation of grinders in the type referred to there is a very heavy back-thrust upon the drive shaft due to the back pressure of the material against the screw, which in machines as heretofore constructed has caused considerable trouble, in that the bearings wear rapidly causing the drive shaft to Wabble, creating a condition in which there is an undue amount of friction in the bearings and an imperfect engagement of the driving gears. Furthermore, in machines as heretofore constructed, a large part of the wear has been upon parts of the drive-shaft itself with the result that the life of the drive shaft has been comparatively short, requiring frequent replacement.

It is the object of the present invention to provide means for taking up the back thrust on the drive shaft without subjecting any part of the drive shaft to excessive wear.

A further object is to provide thrust bearings which may be readily removed and replaced without disconnecting the drive shaft and driving gears.

A further object is to so mount the drive shaft that wabbling is prevented even though the thrust bearings become worn.

Other objects will be ap arent from the following description an accompanying drawings. V

The following description and accompanying drawings set forth in detail certain means embodying the invention, the disclosed means, however, constituting but one of the various mechanical forms in which the principle of the invention may be emphiged.

eference should be had to the accompanying drawings forming a part of this specification, in which Fig. l is a side elevation of the machine, a ortion of the stand being broken away to s ow the thrust bearins; F s 2 is a h r zont s e 'wn g the supporting stand and gear housing showing the mounting of the drive shaft.

Referring to the accompanying drawings, the supporting stand 1 is usually in the form of a hollow casting having av flat to 2 upon which is secured the motor 3 for driving the grinder. The supporting stand 1 has at the front end thereof a widened and upwardly extending portion 4: adapted to form part of the housing for the gearing which transmits movement from the motor shaft to the grinder drive shaft.

The grinder casing 5 has a forwardly extending portion adapted to enclose the grinder screw and a portion 6 at its rear end adapted to fit upon the housing portion 4 of the stand and completing the gear housing. The housing portion 6 of the grinder casing is detachably secured to the housing portion 4 of the stand so that access may be ,had to the gearing when the grinder casing is disconnected from the supporting stand. The grinder casing 5 has a head portion 7 at its forward end in which the perforated-disc through which the material is forced may be secured and a hopper portion 8 into which the material to be ground is placed.

Within the forwardly extending portion of the casing 5 there is rotatably mounted a screw 9 which has a squared shaft portion at its rear end adapted to fit in a square socket at the end of the driving shaft. The drive shaft 11 is journalled within the upper part of the supporting stand 1, extends through the stand from front to rear in axial alignment with the grinder screw 9, andhas an enlarged front end portion 12 provided with a square socket to receive the squared end 10 of the screw shaft. The enlarged end portion 12 of the drive shaft is journalled in a bearing boss 13 at the rear end of the grinder casing 5, and isprovided with a flange 14 at its rear end enga cable with the boss 13 to limit the forwar movement of the drive shaft.

Splined upon the drive shaft 11 is a gear wheel 15 which has an inte al rearwardly extending sleeve 16 journal ed in the front wall of the supporting stand 1. The gear 15 is within the gear housing formed between the adjoining ends of the supporting stand and grinder casing and is driven from the shaft 17 of the motor by means of a gear 18 on the motor shaft 17 which meshes with a gear 19 on a countershaft 20, which has fixed thereto a small gear 21 meshing with the gear 15 on the drive shaft.

The rear wall of the supporting stand 1 is formed to provide an open ended bearing boss 22 through which the rear end of the driving shaft 11 extends. Thedriving shaft 11 has a reduced rear end portion 23 forming at the inner end thereof a thrust shoulder 24 through which the thrust of the shaft is transmitted to the thrust bearings. The thrust bearings for the drive shaft 11 fit within the boss 22 in the rear wall ofthe supporting stand and consist of a front washer 25 fitting over the reduced end portion 23 of the shaft and engaging the thrust shoulder 24:, and rear washer 26 also fitting within the boss 22 and over the reduced end of the shaft 23 and balls 27 interposed between the washers 25 and 26.

The thrust bearing is secured in place within the boss 22 and against the thrust shoulder 24: of the shaft by means of a detachable cap 28 which has an inner portion fitting within the boss 22, flanges overlying the outer end of the boss and bolted thereto, and a rearwardly extending-bear-.

ing portion 29 within which the end of the reduced .portion 23 of the shaft 11 is journalled' In the operation of the machine the back thrust of the screw is transmitted through the shaft 11 to the washer 25 of the thrust bearing. By reason of this arrangement the entire thrust of the shaft is taken by a single hearing at its rear end. Wear upon the thrust hearing will merely result in a slight rearward movement of the drive shaft which will be permitted by the bearings at the front and, rear ends of the shaft. In view of the fact that the drive shaft is journalled inbearings at its front and rear end which receive none of the rearward thrust of the shaft and in which the shaft may have a limited sliding movement, wear upon the thrust hearing will not cause wabbling of the drive shaft. If the thrust bearing becomes worn, it can be readily removed and re fiaced by removing the cap 28.

. aving described my invention, I claim: 1. A ower driven grinder, comprising-m supporting stand, a motor carried by said stand, a grinder casing detachably secured to"the front end of said stand, a. screw in said casing, a drive shaft for said screw extending through the supporting stand and raeaeaa journaled therein, said shaft being directly connected to said screw, said drive shaft having a reduced rear end portion providing a thrust shoulder, and said supporting stand having a bearing receiving recess at its rear end, gearing connecting said motor and shaft, and a removable thrust bearing upon the reduced rear end of said shaft and fitting within the recess at the rear end of the stand.

2. A power driven grinder, comprising a supporting stand, a motor carried by said stand, a horizontally disposed grinder casing detachably secured to the front end of the stand, a screw. in said casing, a horizontal drive shaft aligned with the axis of said screw and having a detachable driving connection at its front end to said screw, said drive shaft extending through the supporting stand and journaled therein, said drive shaft having a reduced rear end portion providing a thrust shoulder, and said supporting 'stand'having a bearing receiving portion at its rear end, a thrust bearing on said reduced end portion of the shaft engaging said thrust shoulder and fitting within said bearing receiving portion of the supporting stand, a cap detachably secured to said stand for securing said thrust hearing in place, and gearing connecting said motor and stand.

3. A power driven grinder comprising a supporting stand, a grinder casing having a forwardly extending screw receiving portion adapted to be detachably secured to the stand, a screw in the grinder casing, a drive shaft extending through the stand and journaled therein, said drive shaft being axially allgned with said screw and having a driving connection therewith through which it is adapted to receive the back thrust of the screw, said shaft having a reduced rear end forming a thrust shoulder, an open ended cylindrical bearing boss in the rear wall of the supporting stand, a thrust bearing on the reduced rear end of the shaft engaging the thrust shoulder thereon and fitting within said open boss, a cap detachably secured to the stand over the outer end of said open boss for securing said thrust bearing in 'place, said cap having a bearing portion to receive the end of the shaft and gearin within the gear housing connecting said motor and shaft. I

In testimony whereof, I hereunto affix my signature.

lWlllLLllS E. KIDNEY.

Mil 

